Api Shield

May I ask if any Firewall Rule is running and blocking the request, like request comming from a specific country, etc., either some Captcha, or if you have higher Security Level setup, or either a Bot Fight Mode option being enabled?

It seems to me you have violated a Firewall rule, which was configured by you (the site owner).

Hopefully, if it is your domain, could you re-check your firewall events and see if there is anything being logged? - either to allowlist/bypass your IP address of your host origin/server so the request could successfully pass?

Otherwise, if you are a visitor, I am afraid you would either need to contact the site owner regarding this issue.

Regarding error 1020, kindly see below articles for more information:

https://support.cloudflare.com/hc/en-us/articles/360029779472-Troubleshooting-Cloudflare-1XXX-errors#error1020